Coway Airmega 400 vs IQAir HealthPro Plus
Bottom line
In our scoring the Coway Airmega 400 edges ahead at 4.0/10 versus the IQAir HealthPro Plus at 3.6/10, both in our Limited band, so this is close. We give the Coway the nod mainly because its CADR is AHAM-verified where the IQAir's is not, and because it is the cheaper unit to both buy and run over five years. The IQAir's genuine strength is its sealed-system H13 media plus a 5-lb carbon filter for gases, which the Coway does not offer; if sealed filtration and carbon gas capacity matter most to you, in our view it is the more defensible pick despite the higher price. Both share the same catch in our data: each unit's claimed room size exceeds what its CADR can deliver, which caps both scores.
The clearest split here is verification and running cost. The Coway Airmega 400's CADR (328 smoke, 328 dust, 400 pollen) is AHAM-verified, while the IQAir HealthPro Plus has no AHAM-verified CADR on the books at all. The Coway also costs less on both ends: $649 up front versus $899, and $129 a year in filters (about $1,294 over five years with the device) against the IQAir's $195 a year (about $1,874 over five years). The IQAir does carry a sealed H13 HEPA system and a 5-lb (2,270 g) carbon gas filter, which the Coway lacks.
| 400 cfm (AHAM-verified) | CADR (independently verified?) | no CADR published |
| 3.0 | Verified Performance30% | 3.0 |
| 1.0 | Total Cost of Ownership25% | 0.0 |
| 3.0 | Certification15% | 2.0 |
| 8.0 | Safety15% | 8.0 |
| 8.0 | Practical Fit15% | 8.0 |
FAQ
- Is the Coway Airmega 400 better than the IQAir HealthPro Plus?
- In our scoring the Coway Airmega 400 rates 4.0/10 and the IQAir HealthPro Plus 3.6/10. In our scoring the Coway Airmega 400 edges ahead at 4.0/10 versus the IQAir HealthPro Plus at 3.6/10, both in our Limited band, so this is close. We give the Coway the nod mainly because its CADR is AHAM-verified where the IQAir's is not, and because it is the cheaper unit to both buy and run over five years. The IQAir's genuine strength is its sealed-system H13 media plus a 5-lb carbon filter for gases, which the Coway does not offer; if sealed filtration and carbon gas capacity matter most to you, in our view it is the more defensible pick despite the higher price. Both share the same catch in our data: each unit's claimed room size exceeds what its CADR can deliver, which caps both scores.
- Which one scores higher in your rubric?
- In our scoring the Coway Airmega 400 scores 4.0/10 and the IQAir HealthPro Plus scores 3.6/10, a narrow 0.4 gap with both in our Limited band. We lean Coway because its 400 cfm CADR is AHAM-verified and it is cheaper to buy ($649 vs $899) and run ($1,294 vs $1,874 over five years). The margin is small enough that buyers who specifically want sealed H13 filtration with carbon gas capacity may reasonably prefer the IQAir.
- Is the IQAir HealthPro Plus worth the extra money?
- In our view, not on the verified data alone. It costs $250 more up front and about $580 more over five years in filters than the Coway, yet we found no AHAM-verified CADR for it, while the Coway's CADR is verified. The IQAir's case rests on its sealed-system H13 media and 5-lb carbon gas filter, which the Coway lacks - if those features are your priority, the premium is more justifiable.
- Does either one really cover its claimed room size?
- We found that both overstate coverage relative to their CADR. The Coway is rated for 1,560 sq ft, but on its AHAM CADR we put the honest ceiling at about 508 sq ft. The IQAir is rated for 406 sq ft, but it has no AHAM-verified CADR to back that figure. The claimed-size overstatement is a hard fail that caps both scores in our rubric.